In addition to getting WDS to work on my network.  I also enabled Quality of Service (QoS).  I was having some problems with my Vonage service and thought this might help.  I added two entries for QoS on my router.  One that makes my Vonage box have the highest priority and one that makes my XBox have elevated priority.  This way internet usage should not get in my way of talking on the phone or with playing games.